What are variables in Typescript? How to create a variable in Typescript?

A variable is a named space in the memory which stores a particular value. While declaring a variable in Typescript, certain rules should be followed like-

1. A variable name should contain alphabets and numeric digits.
2. It cannot contain spaces and special characters except underscore (_) and dollar ($) sign.
3. A variable name cannot begin with a digit.

You should always keep in mind, that a variable should be declared before being used. Variables in Typescript are declared by placing a “var” keyword prior to the variable name. A variable can be declared using 4 methods: –

• Declare its type and value in one statement.Syntax- var variable_name:string = value;
• Declare its type but no value.Syntax- var variable_name:string;
• Declare its value but no type.Syntax- var variable_name = value;
• Declare neither value nor type.Syntax- var variable_name;